Honestly; if I could get a board with the Feature Set of the Sidewinder x4 but with some Cherry MX-Clear/White switches I'd just be in heaven. Blacks or Browns would be good too though.
But USB with that 26 Key Roll Over (or Anti-Ghosting as they say) and the additional Macro Keys would be very nice.
Swappable num-pad is so-so in my book. Removable in the end though is nice because you can make the board smaller if you want/need.
And the 26 key thing with the x4 is just marketing. It supports 6 key strokes at the same time (+ maybe a few modifiers ).
I would love space saving. But the only mechanical sold in finland seems to be SS 6Gv2. Weird. Maybe manufacturers just don't want to make KB's with the layout.
My 6Gv2 is arriving in the next few days if everything goes well.. I ordered some other products as well with it so it might take a little longer too. I want it now! . But it might take over a week.